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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f871039812de5f80d3d8ac7675e64bd1d0b57ff9ca9083c9a949d87a4ea5bd0d' 
  AND token = 'aEIflUyyRl+LTPM6weBuHVuIjMAwBnpQ2d0vVefZZvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}